auxesis

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auxesis

[‚ȯg′zē·səs]
(physiology)
Growth resulting from increase in cell size.
References in periodicals archive ?
After a single sintering treatment, it is possible that auxetic behavior has been induced on the plunger end of the samples but it is only found at very low strains and at levels where confidence in the measured values is not high.
This is a significant finding and agrees with previous work (22) on the auxetic cylinders produced by compaction, sintering, and extrusion.
To start with, the only change in the production of auxetic PP films compared to the production of auxetic PP fibers was the change in the die geometry from hole to slit orifice.
Since the process to produce auxetic melt extruded products relies on only partial melting of the polymeric powder, then the DSC curve confirms the flat temperature profile in the region of 159[degrees]C chosen for this work (based on the previous production of auxetic PP fibers [11]) is reasonable in the attempt to produce auxetic PP films.
After double sintering, however, the midspan region of the specimen was found to be auxetic at strains of up to 5%, before becoming slightly positive as the strain increased.
auxetic behavior was observed) and so are not presented here.
The aim of this study was, thus, to produce a modified version of the auxetic expanded UHMWPE that would allow a more satisfactory investigation of the material microstructure to be carried out, while maintaining enough structural integrity to be able to chart the effects of the extent of the fibrillation on the Poisson's ratio and related mechanical properties.
The original processing route developed to produce auxetic expanded UHMWPE consisted of the three powder processing techniques of compaction, sintering and extrusion.
Auxetic materials are also predicted to possess attractive acoustic properties (16) and it has been found that at frequencies up to 1600 Hz auxetic forms of polymeric and metallic foams had enhanced acoustic absorption when compared with conventional materials (17.
This paper attempts to evaluate the mechanical properties of auxetic UHMWPE produced by the new two-stage processing route in terms of measuring the density and flexural strength of the extrudates.
Since both PTFE and UHMWPE exhibit auxetic behavior solely because of their microstructures and not because of any intrinsic material property, it should be possible to develop processing routes that would produce similar behavior in other polymers.
As one of the major areas of this work was to examine the effects of powder morphology on the ability of a polymer to be processed into an auxetic form, the initial area of experimental work concerned examination of the powder morphology of three grades of PP powder, to be referred to as PP1, PP2, and PP3.